But is the problem that the world doesn't have a good road-trip-planning app, or that the world doesn't take enough road trips to warrant such an app? That's more of Garry's point, at least as I interpreted it. Lots of people have travel-planning needs at the moment they're planning travel. Unfortunately, most people don't travel all that often.

How often do you take road trips like this one? More than once a year? Monthly? Weekly? If you can convince me that there is a large addressable market full of people who take weekly or monthly road trips, I'll grant you that someone needs to spend some cycles making a better road trip app.

Now, this isn't to say that it's not a real problem. Clearly it is. Case in point: you're taking a road trip, and the apps you've looked through suck. You'd love something better. As would others. Fair. So perhaps the ideal solution here is for someone to make a better road trip planning app on the side, as a hobby. It's probably not a big enough market to warrant a startup. The use case is too specific and too infrequent to build a viable, fast-growing business model around.